Patent US1867496A successfully refreshed from Google Patents.
US4441978A
Expired / Lapsed
US
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Separation of proteins using electrodialysis - isoelectric focusing combination
Assignee: Veolia WTS Systems USA Inc
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Filing: 1983-02-16
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Granted: 1984-04-10
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Expires: 2003-02-16
Abstract
Abstract A process and apparatus for treating a liquid protein mixture is disclosed in which the protein mixture is first demineralized by electrodialysis (ED) and then subjected to isoelectric focusing (IEF) to effect the separation of proteins based on differences in their isoelectric points (pI). This combination of ED-IEF results in an improved separation of the protein components of a mixture than without the ED step.
Inventors
- 👤 Surendar M. Jain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/447; G01N27/44756; G01N27/44773; B; B01; B01D; B01D57/00; B01D57/02; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/463; G01N27/44795
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
Apparatus for the treatment of protein containing liquids comprising an electrodialysis membrane cell for desalting said liquids having substantially alternating desalting and concentrating chambers in combination with a isoelectric focusing membrane cell having substantially parallel channels with conduit means for passing the resulting desalted liquids from said electrodialysis cell into a reservoir and further conduit means for passing the said liquid to said channels of said isoelectric focusing cell.
Claim 2
Dependent Claim
69 words
Apparatus for the treatment of protein containing liquids comprising an electrodialysis membrane cell for desalting said liquids having substantially alternating desalting and concentrating chambers in combination with a isoelectric focusing membrane cell having substantially parallel channels with conduit means for passing the resulting desalted liquids from said electrodialysis cell into a reservoir and further conduit means for passing the said liquid to said channels of said isoelectric focusing cell.
Claim 3
Dependent Claim
26 words
The apparatus as claim 1 wherein the membranes of the electrodialysis cell comprise cation and anion permselective membranes arranged in alternating fashion within the said cell.
Claim 4
Dependent Claim
28 words
The apparatus of claim 1 wherein the membranes of said isoelectric focusing cell are electrically neutral microporous diffusion membranes arranged in a substantially parallel position within said cell.
Claim 5
Dependent Claim
24 words
The apparatus of claim 1 wherein means are provided for removing any turbidity present in said protein liquids prior to passage into said reservoir.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |